From d76f21d508b21ab48a3a96b19b789ff16cec15f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torma=20Krist=C3=B3f?= <tormakristof@tormakristof.eu>
Date: Sun, 6 Oct 2019 23:56:19 +0200
Subject: [PATCH] isprime

---
 .travis.yml        |  3 +++
 isprime/Dockerfile | 30 ++++++++++++++++++++++++++++++
 isprime/go.mod     |  1 +
 isprime/isprime.go | 39 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 73 insertions(+)
 create mode 100644 isprime/Dockerfile
 create mode 100644 isprime/go.mod
 create mode 100644 isprime/isprime.go

diff --git a/.travis.yml b/.travis.yml
index c9e4e89..0da2fb2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,3 +9,6 @@ script:
   - cd hello-world
   - docker build -t=docker.pkg.github.com/tormachris/knative-report-functions/hello-world .
   - docker push docker.pkg.github.com/tormachris/knative-report-functions/hello-world
+  - cd ../isprime
+  - docker build -t=docker.pkg.github.com/tormachris/knative-report-functions/isprime .
+  - docker push docker.pkg.github.com/tormachris/knative-report-functions/isprime
diff --git a/isprime/Dockerfile b/isprime/Dockerfile
new file mode 100644
index 0000000..f06c711
--- /dev/null
+++ b/isprime/Dockerfile
@@ -0,0 +1,30 @@
+# Use the offical Golang image to create a build artifact.
+# This is based on Debian and sets the GOPATH to /go.
+# https://hub.docker.com/_/golang
+FROM golang:1.13 as builder
+
+# Create and change to the app directory.
+WORKDIR /app
+
+# Retrieve application dependencies.
+# This allows the container build to reuse cached dependencies.
+COPY go.* ./
+RUN go mod download
+
+# Copy local code to the container image.
+COPY . ./
+
+# Build the binary.
+RUN CGO_ENABLED=0 GOOS=linux go build -v -o server
+
+# Use the official Alpine image for a lean production container.
+# https://hub.docker.com/_/alpine
+# https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds
+FROM alpine:3
+RUN apk add --no-cache ca-certificates
+
+# Copy the binary to the production image from the builder stage.
+COPY --from=builder /app/server /server
+
+# Run the web service on container startup.
+CMD ["/server"]
diff --git a/isprime/go.mod b/isprime/go.mod
new file mode 100644
index 0000000..16c6805
--- /dev/null
+++ b/isprime/go.mod
@@ -0,0 +1 @@
+module github.com/tormachris/knative-report-functions/isprime
diff --git a/isprime/isprime.go b/isprime/isprime.go
new file mode 100644
index 0000000..12cd0b2
--- /dev/null
+++ b/isprime/isprime.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+  "fmt"
+  "log"
+  "net/http"
+  "os"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+    target := os.Getenv("TARGET")
+    num, err := strconv.Atoi(target)
+	if err != nil {
+		return "", fmt.Errorf("Failed to parse %s as int! %v", target, err)
+	}
+	logrus.Infof("Checking if %s is prime", target)
+	if num <= 1 {
+		return fmt.Fprintf(w,"%d is not prime", num), nil
+	}
+	for i := 2; i <= int(math.Floor(float64(num)/2)); i++ {
+		if num%i == 0 {
+			return fmt.Fprintf(w,"%d is not prime", num), nil
+		}
+	}
+	return fmt.Fprintf(w,"%d is prime", num), nil
+}
+
+func main() {
+  log.Print("Hello world sample started.")
+
+  http.HandleFunc("/", handler)
+
+  port := os.Getenv("PORT")
+  if port == "" {
+    port = "8080"
+  }
+
+  log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), nil))
+}